AW: Re: Regex help needed...

Peter Haworth pete at lcsql.com
Wed Feb 3 15:10:12 EST 2016


Hi Thierry,
I might have missed it but did you publish your Regex2 to the list?
Pete

On Wed, Feb 3, 2016 at 12:07 PM Richard Gaskin <ambassador at fourthworld.com>
wrote:

> Thierry Douez write:
>
> >>  Regex has  been around a long time
> >>  and lots of smart computer science types has
> >> spent time coming up with ways to optimize its performance for pattern
> >> matching.
> >
> > That's was true, it's still true and will always be true!
>
> It's true that there are almost always ways to improve performance using
> any method, but there are times when one method may be faster than
> another so it's worth testing out, as you did here:
>
> > and here are some benchmarks
> > done in a late rainy sunday evening:
> >
> >
> > * Regex2 faster than Chunk by: 2.1 times*
>
> Great results - what was the regex you used for that?
>
>
> > For the details:
> >
> > 1) Regex1 is the original regex, Chunk1 is  from Richard, Regex2 is mine.
> > 2) You can noticed the difference in time depending on the value of pPage
> >     ( that's a normal behavior with regex)
> > 3) I've done the calculation the same way as Richard did, so you can
> compare
> >
> >
> >
> > ******  aPage = 1, Same? true true
> > Regex1: 8943 ms
> > Chunk1: 210 ms
> > Regex2: 99 ms
> >         Regex2 faster than orig regex by: 90.3 times
> >         Regex2 faster than Chunk by: 2.1 times
> >
> > ******  aPage = 2, Same? true true
> > Regex1: 9946 ms
> > Chunk1: 212 ms
> > Regex2: 100 ms
> >         Regex2 faster than orig regex by: 99.5 times
> >         Regex2 faster than Chunk by: 2.1 times
> >
> > ******  aPage = 3, Same? true true
> > Regex1: 4451 ms
> > Chunk1: 210 ms
> > Regex2: 98 ms
> >         Regex2 faster than orig regex by: 45.4 times
> >         Regex2 faster than Chunk by: 2.1 times
> >
> > ******  aPage = 4, Same? true true
> > Regex1: 11465 ms
> > Chunk1: 200 ms
> > Regex2: 98 ms
> >         Regex2 faster than orig regex by: 117 times
> >         Regex2 faster than Chunk by: 2 times
> >
> > ******  aPage = 5, Same? true true
> > Regex1: 11457 ms
> > Chunk1: 201 ms
> > Regex2: 94 ms
> >         Regex2 faster than orig regex by: 121.9 times
> >         Regex2 faster than Chunk by: 2.1 times
> >
>
> --
>   Richard Gaskin
>   Fourth World Systems
>   Software Design and Development for the Desktop, Mobile, and the Web
>   ____________________________________________________________________
>   Ambassador at FourthWorld.com                http://www.FourthWorld.com
>
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